I brought a Sup and not long after the grips are starting to peel off.. Can someone tell me if this is normal? Should i be taking it back?

It can happen Rabbit but it shouldn't.
Depends how bad and what sort of board.... If it is a bargain board and the peeling is minimal.... grab some contact adhesive and stress less. If you paid a motza and the deck is really coming off, back to the supplier asap.

Same advice, but use MS Polymer glues: ultra-efficient, but not harmful to you or the board (no solvent).